Barksdale DPD2T-H18SS Pressure Vacuum Actuated Switch

The Barksdale DPD2T-H18SS is a dual-contact differential pressure switch designed for reliable monitoring of low to moderate pressure differentials in pumps, compressors, HVAC, filtration, and engine systems. Part of Barksdale’s DPD1T/DPD2T family, the H18SS suffix denotes a hermetically sealed, stainless-steel version with welded wetted parts for rugged environments. It provides a fixed differential operating range from 0.4 to 60 psi (0.03 to 4.1 bar) with a maximum working pressure of 60 psi, and hosts two independent SPDT switching elements (DPD2T) on a common pressure port, using a 6-pin terminal block for wiring. The unit is UL and CSA listed and can be ordered with factory presets and NEMA 4 or 4X enclosures to suit indoor or outdoor installations; the hermetic 18SS variant is especially appropriate where moisture or contamination must be contained. Operating temperature spans -54°C to +74°C (-65°F to +165°F), enabling stable operation across diverse industrial environments. Typical applications include pump and compressor monitoring, HVAC control, engine monitoring, filtration systems, and other process-control duties where two alerts or controls are required from a single differential pressure source.